the hunger hormone could also make you more intelligent

The chemical ghrelin is produced by the stomach and is released after long times without food. It makes you feel hungry, but it also may play a role in brain function.

One study found that mice injected with ghrelin showed better performance in memory and learning tests by up to 40%. Even more exciting, another study found that ghrelin injections improved memory and spatial orientation in mice with Alzheimer's disease.

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